I came accross this, because a lot of regression tests were saying: ``` (lldb) p argc error: expression failed to parse: error: couldn't install checkers, unknown error ``` With this change, error messages provide more detail: ``` (lldb) p argc error: expression failed to parse: error: couldn't install checkers: error: Couldn't lookup symbols: __objc_load ``` I didn't find a case where `Diagnostics()` is not empty. Also it looks like this isn't covered in any test (yet). Reviewed By: bulbazord, Michael137 Differential Revision: https://reviews.llvm.org/D146541
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